All Ben 10 Alien Force Episodes _verified_ -

— After a teleporter accident, Ben and a Highbreed officer named Reinrassig III are stranded alone on a desert planet. Forced to work together against deadly alien predators, they form an uneasy alliance and eventually become friends. This episode famously lays the foundation for the Highbreed's redemption.

Season 2 aired from to March 27, 2009 .

Ben unlocks Alien X, his most powerful form, to stop an alien emperor. Season 2: The War of the Worlds

A bounty hunter cuts off Ben's hand while it is transformed, leaving Ben's detached hand to navigate Earth while Ben is trapped in a void. Key Villain: Sunder. Episode 34: "If All Else Fails" all ben 10 alien force episodes

(S1E12, Jul 19, 2008) – A group of young freelance Plumbers mistakes Ben’s team for a threat, leading to a clash before they unite against DNAliens.

(S1E9, Jun 14, 2008) – Bullies Cash and JT find one of Kevin’s robotic gauntlets and use it to attack Ben. Kevin must recover the gauntlet and accept his place on the team.

: A prince from another world asks Ben to help retrieve a "holy artifact". : A giant baby alien is found in a construction site. War of the Worlds: Part 1 & 2 — After a teleporter accident, Ben and a

– Gwen travels back in time to prevent Kevin's mutation, accidentally creating a dystopian alternate timeline.

Dr. Animo (as D'Void) and a surprise survival reveal for Grandpa Max. Episode 22: "Inside Man"

— Darkstar convinces Kevin to join him in seeking an ancient artifact that could restore them both. Season 2 aired from to March 27, 2009

(S2E11, Mar 25, 2009) – Ben discovers a baby alien monster and must reunite it with its parents before DNAliens can exploit it.

Incursean Emperor Milleous threatens to destroy Earth, forcing Ben to unlock Alien X and debate its inner personalities. Season 2: The Highbreed War (Episodes 14–26)

Ben uses diplomacy and the truth of the peace treaty to stop the catastrophe. Episode 35: "Charm School"

Vilgax returns, conquering worlds and challenging Ben to a duel. Trying to unlock the Master Control again, Ben accidentally breaks the Omnitrix.